“…OBERLIN and MERING [15] detected the presence of four structural forms whose defects and distortions have been studied in detail [16]. The same technique of oxydation applied to irradiated graphites led other workers [17] to conclude that, depending upon the temperature and the dose of irradiation, two or three structural forms can be identified. In both studies, interlayer spacings of 3.36A, 3.37 A, 3.40A and 3.44A are involved.…”